$OpenBSD: patch-build_toolchain_openbsd_BUILD_gn,v 1.2 2017/04/19 05:16:46 robert Exp $
--- build/toolchain/openbsd/BUILD.gn.orig.port	Wed Oct 19 13:16:59 2016
+++ build/toolchain/openbsd/BUILD.gn	Wed Oct 19 14:23:37 2016
@@ -0,0 +1,52 @@
+# Copyright 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/sysroot.gni")
+import("//build/toolchain/gcc_toolchain.gni")
+
+clang_toolchain("clang_x86") {
+  toolchain_args = {
+    current_cpu = "x86"
+    current_os = "openbsd"
+  }
+}
+
+gcc_toolchain("x86") {
+  cc = "gcc"
+  cxx = "g++"
+
+  readelf = "readelf"
+  nm = "nm"
+  ar = "ar"
+  ld = cxx
+
+  toolchain_args = {
+    current_cpu = "x86"
+    current_os = "openbsd"
+    is_clang = false
+  }
+}
+
+clang_toolchain("clang_x64") {
+  toolchain_args = {
+    current_cpu = "x64"
+    current_os = "openbsd"
+  }
+}
+
+gcc_toolchain("x64") {
+  cc = "gcc"
+  cxx = "g++"
+
+  readelf = "readelf"
+  nm = "nm"
+  ar = "ar"
+  ld = cxx
+
+  toolchain_args = {
+    current_cpu = "x64"
+    current_os = "openbsd"
+    is_clang = false
+  }
+}
